Chaser and means for holding the same



Dec. 17, 1 929. 5, M N 1,739,646

CHASER AND MEANS FOR HOLDING THE SAME Filed March 12, 1927 zsneets-sneet 1 Mi 5% Kg 54 I, v I l i H 3/ M m i SamyelFAku/man auomeq Dec. 17,-1929. s. NEWMAN 1,739,646

CHASER AND MEANS FOR HOLDING THE SAME Filed March 12. 1927 2 Sheets-Sheet 2 4 Samuel F Newman Patented Dec. 17, 1929 UNITED STATES PATENT OFFICE SAMUEL F. NEWMAN, OF WAYNESBORO, PENNSYLVANIA,-ASSIGNOR TO LANDIS MACHINE COMPANY, OF WAY NESBORO, PENNSYLVANIA, A CORPOFATION GHASER AND MEANS .FOR HOLDING THE .SAME

Applicatipn filed March 12, 1927. Serial No. 174,850.

My said invention relates to chasers and means for clamping the same, used in cutter heads for-.cutting threads on pipes, tubes, etc., said chasers being of the tangential type.

When cutting long tapered threads such as are commonly used on pipes and tubes, it is necessary to use chasers of different widths as the length of the threads is determined by the width of thechaser. Hereto- 1o fore in order to use different width chasers it was necessary to completely change the chaser holding mechanism. In cutting threads on tubes and pipesthere is a large variety of lengths combined with changes in pitch and taper and it is desirable to use chasers so that the proper combination of pitch, taper and length of threads is secured without excessive width chasers or chaser holders being used, or without the substitution of new holders.

It isan object of this invention to provide chasers and chaser holding mechanism so that different width chasers can be secured in the same holding'or clamping device. Another object of my invention is to secure positive adjustment and backing-up means to the chaser so as to secure ease and accuracy of adjustment of the chaser laterally in the holder and to provide abutting means. to properly take up the resultant forces due to thread cutting. Other objects of my invention will become apparent as the description proceeds.

Referring to the accompanying drawings which are made a part hereof and on which similar reference characters indicate similar parts, v

Figure 1 is a plan view of mounted in its holder, Figure 2, a side elevation, Figure 3, a front elevation of the same,

Fi ure 4, a side elevation corresponding to Fig. 2 but using wider chasers,-

. Figure 5, a side elevation using a still wider chaser. v

Figure 6, a plan elevationof Figs. 4 and 5,

Figures 7, 8, 9 and 10, are views of different width chasers, and 1 1 Figures 11 and 12 are views of the clam which holds and abuts the chaser.

the chaser In Figs. 1 to 6 of the drawings reference character 10 indicates a slide or holder of any conventional design on which may be mounted a chaser as 12,13 or 14. As shown in 1 his parallel depending edges 17 and 20 cut at an angle to fit corresponding grooves 18 and 21 in the holder 10 and the chaser 12 respectively. As shown in Fig. 2, the inner edge 17 of the clamp rests upon the inclined shouder of the groove 18 in the holder 10. The edge 20 is cut at an angle opposite to that of the edge 17 and engages a beveled notch 21 in the chaser 12. It will be apparent from the showing in Fig. 2 that as the clamp 16 is tightened to the holder 10 the beveled edges 17 and 20 riding upon the inclined surfaces 18 and 21 will force the chaser 12 tightly against the seat 11 and at the same time will hold it securely against the face of the block somewhat in the nature of a dovetail joint. The chasers are adjusted longitudinally of the holders by screws 22 seated in non-threaded holes 23 ofthe holder 10 and operating on worm threads 24 of the chasers.

As shown in Fig. 11 the clamping member 25 has a projecting ear 26, the said ear having a threaded opening 27 for receiving abutting screws 28 which screws abut against the chaser.

Figs. 7, 8 and 9 show different width chasers which ma be used in the same holder and clamp. Fig. has a beveled base 15 and a cut-away back at 21 and a cut-away portion at 34. Fig. 8 has a beveled base 15, a cutaway back at 21 and a portion of the opposite side from the beveled base cut-away as at 29. Fig. 9 has a beveled portion at 30, a back cut-away at 21f, a projecting portion 31 adjacent to the beveled base and a portion cutaway at 32 opposite the beveled base and projecting portion 31. The chasers shown in Figs. 7, 8 and 9 all have worm threads hobbed on the back at 24, 24 and 24" respectively.

Fig. .10 is a face View of Figs. 7, 8 and 9 showing a cut-away corner portion 32 to provide an abutting edge. This corner is desigagainst which an extending ear 26 on'the chaser clamp abuts. The abutment 26 on the clamp has a screw 28, as shown in Fig. 6, which receives the thrust of the chaser against the clamp. Without the ear 26 on'the clamp to receive the end thrust of the chaser during cutting operations the WVllOlB thrust on the chaser would have to be against the abutting screw 22. With very large chasers, therefore, it is necessary to provide abutting means at the end .of the chaser and near the top of the chaser to assist in receiving the end th ust; Unless the chasers were cut-off as shown in Figs. 8 and 9 the ear 26 would have to rest against the outer end of the chaser.

In using my invention the chasers'may be mounted upon the holder 10 as shown in Fig. 4: or 5 and the clamping device accurately positioned by means of dowel pin 33 and clamped to the holder. 10 by means of bolts or screws 19. The chaser is abutted and held in its adjusted position through the medium of screws 28 and the chaser members are adjusted longitudinally of the holders by means of screws 22.

From an inspection of the chasers shown in Figs. 7, 8 and 9 and their position in Figs. Land 5, it will be apparent that chasers of various widths may be clamped to the holder 10 by m clamping device without changing any of t e parts.

It will beobvious to those skilled in thee art that, various changes may be made in my device without departing from the spirit of the invention, and I, therefore, doxnot limit myself to what is shown in the drawings and described in the specification, but only as set forth in the appended claims.

Having thus 'fully described my said invention, what I claim as new and desire to secure by Letters Patent, is:

1. A chaseror cutter having a longitudinally grooved face for forming screw threads and a beveled side adjacent to the grooved face, a portion of its back being cut-away ,to form a clamping member in conjunction with the beveled side, with worm threads cut on its back adjacent to the beveled side, and with the side opposite to the beveled side cut-away to form an abutment, substantially as set forth. 2. A- chaser or cutter having a longitudinally ooved face for forming screw threads, wlth portions of its back cut-away to leave an upper extended portion and to form oppositely inclined ribs, worm threads cut upon its back, and having apart of the upper extended portion cut-away to form an abutment, substantially as set forth.

3. A chaser or cutter formed with a longitudinally grooved face for forming screw threads, with a portion of the back cut-away to provide a shoulder adapted to be received in a recess on a holder, a corner portion of 5. A chaser clamping device comprising a base member having an elongated beveled portion adapted to receive a corresponding beveled portion of a chaser, a clamping member secured to the said base and having a depending ed e co-operating with the beveled portion, on t e base to hold the chaser in position, the said clamping member having an ear and adjustable. abutting means therein, whereby chasers or cutters of various sizes may be used without changing the clamp, substantially as set forth.

6. A chaser or cutter having a longitudinally grooved face for forming screw threads,

with upper and lower portions of its back cut away to form oppositely inclined ribs'having upper and lower portions extending beyond the ribs, worm threads out upon the back v and having a part of the upper extended portion cut away to form an abutting surface for an abutting element on theclamp, substantially as set forth. I

In witness whereof, I have hereunto set my hand at 'Waynesboro, Pennsylvania this 9th day of March, nineteen hundred and twentyseven. I

SAMUEL F. NEWMAN. 

